Question

1)Дана строка. Показать третий, шестой, девятый и так далее символы. 2)Дана строка. Заменить каждый четный символ или на 'a', если символ не равен 'a' или 'b', или на 'c' в противном случае

Answer 1

1)
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
int main()
{
string str;
getline(cin, str);
for (int i = 1; i < str.length(); i++)
{
if (i % 3 == 0)
{cout << str[i] << endl;}
}
_getch();
return 0;
}
2)
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
int main()
{ string str;
getline(cin, str);
for (int i = 1; i < str.length(); i++)
{
 if (i % 2 == 0)
 { if (str[i] != 'a')
  { str[i] = 'a'; }
  if (str[i] != 'b')
  { str[i] = 'b'; }
  if (str[i] != 'c')
  { str[i] = 'c'; }
}
}
cout << str << endl;
_getch();
return 0;}

Answer 2

Showing Specific Characters in a String

To show the third, sixth, ninth, and so on characters in a given string, you can use the following Python code:

```python input_string = "Sammy Shark!" result = input_string[2::3] print(result) ``` This code will output the characters at the specified positions in the input string.

Replacing Even Characters in a String

To replace every even character in a string with 'a' if the character is not 'a' or 'b', or with 'c' otherwise, you can use the following Python code:

```python input_string = "Sammy Shark!" result = ''.join(['a' if i % 2 == 0 and c not in ['a', 'b'] else 'c' if i % 2 == 0 else c for i, c in enumerate(input_string)]) print(result) ``` In this code, we iterate through the characters of the input string and replace them based on the specified conditions.

These code snippets provide the solutions to the given tasks.